Including Files in PHP

Let's say we have a file that stores a set of functions:

<?php
	function square($num) {
		return $num ** 2;
	}
	
	function cube($num) {
		return $num ** 3;
	}
?>

Let's make the functions from this file available in our main file. To do this, include the file with functions using the require operator:

<?php
	require 'functions.php';
?>

After this, in our main file we can use the functions from the included file:

<?php
	require 'functions.php';
	
	echo square(3) + cube(4);
?>

Create a file with a useful set of functions. Include it into your main file.